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    Performance Evaluation of Recovery Based Routing Algorithms in Irregular Mesh NoCs

    , M.Sc. Thesis Sharif University of Technology Hosseingholi, Mahdieh (Author) ; Sarbazi Azad, Hamid (Supervisor)
    Abstract
    Heterogeneity is one of the challenges in the current NoC (Network-on-Chip) domain which oblige designers to consider less regular topologies to provide the best cost-performance trade-off while minimizing resource and power consumption and providing the maximum flexibility. Irregular mesh is a topology which combines the benefits of regularity and advantage of irregularity. Another important issue in any NoC is the selection of routing algorithm which provides the best performance. Routing algorithms especially those coupled with wormhole switching should deal with deadlock occurrences. Deadlock detection and recovery-based routing schemes for this type of switching gained attraction since... 

    Performance Evaluation of Deadlock Avoidance Based Routing Algorithms in Irregular Mesh NoCs

    , M.Sc. Thesis Sharif University of Technology Mahdavinia, Parisa (Author) ; Sarbazi Azad, Hamid (Supervisor)
    Abstract
    It is now possible to integrate hundreds of modules (e.g. processors, memories) in a single silicon die. Handling the communication requirements between such modules by interconnecting them using shared buses is not possible from the performance point of view. One of the solutions is to use a network-on-chip (NoC) based communication infrastructure. NoCs were shown to be effective for solving the global interconnection problem among modules. These architectures emphasize the separation between computing and communication, and guarantee a good degree of design reuse and scalability. Mesh topology is favored by many researchers as the topology of NoCs because of its layout efficiency.... 

    Experimental and Simulation Study of Asphaltene Deposition in Porous Media

    , M.Sc. Thesis Sharif University of Technology Khalili, Mohammad (Author) ; Ghotbi, sirous (Supervisor) ; Kharrat, Reyaz (Supervisor)
    Abstract
    Asphaltene deposition on reservoir rocks occurs during natural depletion as well as miscible injection processes. It causes reduction of effective pore space and consequent impairment of the ability of oil to flow through reservoir. Therefore, deposition of asphaltene causes significant formation damage and wellbore plugging, requiring expensive and difficult cleanup procedures. Thus it is necessary to be able to consider the onset, amount of deposition and also consequent damage of permeability and porosity reduction due to various factors. The objective of current work is to conduct experimental and simulation study of asphaltene deposition dynamics in one of the Iranian reservoirs. In... 

    Simulation of Direct Reduction of Iron Ore Unit In Foolad Mobarakeh Plant And Optimization of Water Consumption

    , M.Sc. Thesis Sharif University of Technology Ebrahimi, Mahdieh (Author) ; Farhadi, Fattolah (Supervisor)
    Abstract
    Due to the importance of the direct reduction method in iron and steel production, the optimum operating condition of this unit has an increasing importance. In some areas, because of the climate conditions and geographical situation and inaccessibility to adequate water, supply of required water for the unit is a major problem. So, many attempts have been performed to decrease water consumption in these units. In this thesis, water consumption of the scrubbers in direct reduction unit of Mobarakeh Steel plant is investigated. First, this unit is simulated. Then with solving the set of equations of mass and heat balances of water circulation, the amount of water consumption in these... 

    Monte Carlo Simulation of Deposition of the Carbon Thin Films by Asymmetric Molecules

    , M.Sc. Thesis Sharif University of Technology Amiri, Mehdi (Author) ; Vesaghi, Mohammad Ali (Supervisor)
    Abstract
    The applications of science and technology of materials grows rapidly nowadays One of the major aspect of this science discuss about the growth of thin films via deposition of molecules and atoms. By this way we can diagnose physical and chemical properties of thin films whose applications in electronics, computer, microelectronic industry, material engineering telecommunications and so advances every day. In this way we smell out the process of the growth of diamond like carbon (DLC) thin films whose importance is extended nowadays. By acknowledgement of variables that influence the dynamics of film formation we make a big jump in attaining the optical, physical and electrical properties of... 

    Network Coding for Distributed Storage System

    , M.Sc. Thesis Sharif University of Technology Hosseini Sohei, Maryam (Author) ; Movaghar Rahimabadi, Ali (Supervisor)
    Abstract
    Network coding is realized to have great potential for improving the performance of uncoordinated distributed networked storage, and also cooperative content distribution networks (Peer-to-Peer networks). In these kinds of systems, file is stored or dispensed in blocks which can be the coded version of the original blocks of the file. The existing network coding scheme in P2P networks (Avalanche) finds coding opportunities and uses them in forwarding en-coded blocks through the network. This scheme uses the swarming technique and network coding together, in a single transmission, and consequently, it achieves several fold increase in the throughput of P2P networks. In this thesis, we have... 

    Semi-Analytical Modeling And Simulation Of Heavy Oil Recovery Through VAPEX Process

    , M.Sc. Thesis Sharif University of Technology Rasti, Fariba (Author) ; Masihi, Mohsen (Supervisor) ; Kharrat, Riyaz (Supervisor)
    Abstract
    VAPEX is a relatively new EOR process for the recovery of heavy oil. In this process solvent is used to form a vapor chamber within a reservoir. Vapor dissolves in the oil and diluted oil drains by gravity to a horizontal production well. The essential features of this recovery mechanism have been discussed in this study. Furthermore, a semi-analytical and a simulation study of VAPEX process have been performed on a specified Iranian heavy oil reservoir (such as Kuh-e-Mond). The aim of this study is to investigate an exponential functionality (correlation) witch incorporates all physical parameters that affect the production rate of VAPEX process in dimensionless form. The adjustable... 

    History Matching using Streamline Simulation

    , M.Sc. Thesis Sharif University of Technology Shojaei, Hasan (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Badakhshan, Amir (Supervisor) ; Kamali, Mohammad Reza (Supervisor)
    Abstract
    Management decisions, Enhanced Oil Recovery, and reservoir development plans in petroleum industries are based on predictions by reservoir simulation. Due to uncertainties in model parameters or engineering assumptions, the simulation results are not accurate, while they are correct. One remedy is to match simulation results with engineering measurements, typically pressure and flow rate, by adjusting model parameters. In Reservoir Engineering literature, this is called History Matching and is an optimization problem. Common methods of history matching are based on finite difference simulation, and therefore have a very low speed. In addition, these methods usually ignore Geostatistical... 

    Numerical Analysis of An Annular Gas Turbine Combustor

    , M.Sc. Thesis Sharif University of Technology Gandomi, Mohammad Hossein (Author) ; Farshchi, Mohammad (Supervisor)
    Abstract
    The goal of this research is the simulation of the annular combustion chamber of the turbine engine utilized by liquid fuel. The achievement to this goal will lead to create numerical tools for parametric study, analysis and combustion chamber designing.For this reason simple geometry has been considered. This simplicity of geometry causes to facilitate in parametric study and decrease in saving time for modeling and meshing. This combustion chamber is a simplified model of engine CF6. In recent study, the k – ε realizable model has been used for turbulence modeling. For non-adiabatic condition, chemical reaction is dissolved by utilizing probability density function along with laminar... 

    Simulation of New Methods in Ventilation of Underground Station Sand Tunnels

    , M.Sc. Thesis Sharif University of Technology Adibi, Omid (Author) ; Farhanieh, bijan (Supervisor)
    Abstract
    Due to growth of the number of passengers in subway transportation systemsthe capacity of the metro stations are on the rise.The generated heat loads in subway line shall be increased by thegrowth of the its capacity. As a result, current subway ventilation systems cannot provide comfort conditions for passengers. Nowadays, modern ventilation systems are designedto improve ventilation performance and to create suitable thermal conditions. Among of these, the under platform andover track exhaust systems and use of platform screen doors can be Cited. The aim of this study is three-dimensional simulation of air flow in modern ventilation systems of subway stations. Numerical simulations are in... 

    Calibration, Simulation and Optimization Well-type Ionization Chamber Used in Medicine

    , M.Sc. Thesis Sharif University of Technology Robatjazy, Hamid (Author) ; Vosoughi, Naser (Supervisor) ; Ghasemi, Mohammad Reza (Supervisor)
    Abstract
    Ionization chamber is used in radiotherapy for to get precise information from amount activity of radionuclide. Ionization chamber filled with Argon is used to measure the activity of brachytherapy radionuclide. This device measures the activity according to the produced current by the incident radiation. In order to obtain the precise activity of the radionuclide, it is necessary to the precise amount of the device calibration factor which relates the amount of the produced current to the activity. Because of little access to standard radionuclide and for appointing the activity of unknown samples, ionization chamber calibration is done indirectly and with the help of the simulation of the... 

    Prediction of Temperature and Strain Distribution in the Warm Rolling of Austenite Stainless Steel

    , M.Sc. Thesis Sharif University of Technology Nemati, Elham (Author) ; Serajzadeh, Siamak (Supervisor)
    Abstract
    In this research, the hot and warm rolling of stainless steel 304 was studied. First the rolling process was simulated using Finite Element Method software ABAQUS and the distribution of temperature and strain in the process under discontinuous conditions were predicted. Next, hot and warm rolling of stainless steel 304 under different conditions was carried out. Specimens were cut and subject to mechanical testing, metallography and electron microscopic studies. Data obtained from these experiments and the predicted trends from ABAQUS were compared, therefore studying the effect of different parameters on the microstructure and mechanical properties of the rolled specimen. Results indicate... 

    Multiscale Finite-Volume Simulation of Multi Phase Flow in Heterogeneous Porous Media

    , M.Sc. Thesis Sharif University of Technology Karimyan, Erfan (Author) ; Pishvaie, Mahmood Reza (Supervisor) ; Taghizadeh Manzari, Mehrdad (Supervisor)
    Abstract
    Multi-Scale finite volume (MSFV) method have been developed and applied for multiphase flow in porous media. The most important advantage of MSFV method is its computational efficiency. In this thesis we apply and implement this method to porous media simulation. Then, computational parameters such as coarsening ratio, effect of threshold on adaptive computation and different boundary conditions for computing basis functions are investigated. The two difficulties of sMSFV method are problems with high permeability contrast and problems with high course grid aspect ratio which are considered. In standard MSFV (sMSFV) method reduced boundary condition is used to determine the basis and... 

    Experimental and Simulation Study of Water Alternating Hydrocarbon - CO2 Mixture Gas in one of Iranian Oil Reservoirs

    , M.Sc. Thesis Sharif University of Technology Alizadeh, Ali (Author) ; Taghikhani, Vahid (Supervisor) ; Ghazanfari, Mohammad Hossein (Supervisor) ; Badakhshan, Amir (Supervisor)
    Abstract
    In this work the effect of composition changes of the injection gas (Hydrocarbon gas + carbon dioxide) on Water Alternating Gas (WAG) performance in immiscible flooding which has been rarely attended in the available literature is investigated. Core flood experiments are conducted on a 10 cm length Sarvak sandstone core sample at 46 degree C and at immiscible condition, i.e., below the minimum miscible pressure (MMP) of the oil sample using pure CO2 as injected Gas.The influence of injection WAG ratio on oil recovery also is investigated. Artificial injection brine which is made by dissolving NaCl into distilled water with 5000 ppm (mg/L), NaftShahr oil which has about 41 API gravity and... 

    Simulation Optimization Using Hybrid and Adaptive Metamodels

    , M.Sc. Thesis Sharif University of Technology Akhavan Niaki, Sahba (Author) ; Mahlooji, Hashem (Supervisor)
    Abstract
    In this thesis we propose a new metamodel based simulation optimization algorithm using sequential design of experiments. The main objective is to have a new method which can be used without deep knowledge of different kinds of metamodels, optimization techniques and design of experiments. The method uses three metamodels simulataneously and gradually adapts to the best metamodel. In each iteration, some points are chosen as candidates for future simulation. These points are ranked based on the quality of metamodel prediction and their placement among simulated points, the best point will be chosen for simulation. Comparing the proposed algorithm with some of the popular simulation... 

    Simulation of GAGD Process to Study the Impact of Effective Parameters on Operability Range and Recovery Factor

    , M.Sc. Thesis Sharif University of Technology Nasiri, Javad (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Bozorgmehry, Ramin (Supervisor)
    Abstract
    Gravity drainage is the self-propulsion of oil downward in the reservoir rock. Under favorable natural and operational conditions, it has been found to effect recoveries comparable to water displacement. With modern technical knowledge, the operator can often make a choice between dissolved gas drive, water drive and gravity drainage as the principal recovery agent in a reservoir. So far, gravity drainage has received less consideration than the other two. Gravity drainage is one of the most important processes taking place in fractured reservoirs and it plays a major role in oil recovery from low permeability matrix blocks during gas injection process. Gravity drainage is responsible for... 

    Simulation of Spontaneous Capilary Imbibition and Gravity Effects on Oil Recovery in Naturally Fractured Reservoirs  

    , M.Sc. Thesis Sharif University of Technology Bassirian, Mostaafa (Author) ; Jamshidi, Saeed (Supervisor) ; Bozorgmehri, Ramin (Supervisor)
    Abstract
    Oil reservoirs, have integrated identity; that is they consist of different parameters such as wettablity, initial water saturation, capillary and gravity forces, etc. which are related to each other and affect ultimate recovery simultaneously. In fractured reservoirs, other parameters such as fractures and complex geological structures are also considered  among  important  parameters  which  affect  ultimate  recovery.  Due  to  large  amount  of reserves,  fractured  reservoirs  are  subject  to  different  studies  and  simulations.  In  this  research, different  parameters  which  affect  ultimate  recovery  in  fractured  reservoirs,  are  studied  and simulated. Different  studies ... 

    Comparison Between Methods Of Synchronization In A Queue With Finite Customer Population

    , M.Sc. Thesis Sharif University of Technology Kazemi, Hesam (Author) ; Mahlooji, Hashem (Supervisor)
    Abstract
    One technique to reduce variance of output in comparing two or more systems via simulation is random number synchronization. the primary technique for achieving synchronization is to assign an independent seed to each random process and then use the same collection of seeds across all systems . Another way of synchronization in systems with limited customer population is to assign different seed to each customer (transaction) and then use the same collection of seeds across all systems. The main Question to be considered here is which of these methods of synchronization can better reduce variance of output in a queue with finite customer population  

    Experimental Investigation of Heavy Oil Recovery by Liquid CO2 Huff and Puff Method

    , M.Sc. Thesis Sharif University of Technology Ekhlasjoo, Iman (Author) ; Vossoughi, Manoochehr (Supervisor) ; Shadizadeh, Reza (Supervisor) ; Kharrat, Reeaz (Supervisor) ; Ghazanfari, Mohammad Hossein (Co-Advisor)
    Abstract
    In recent years, carbon dioxide is used for enhanced oil recovery of heavy oil. Steam Huff and Puff is one of the enhanced oil recovery methods used for heavy oil. In this study liquid CO2 was used as an injecting fluid instead of steam. In this paper a series of experiments were performed to demonstrate the effect of carbon dioxide injection pressure on huff and puff process. The experimental data are used in lab scale model simulated with commercial simulator Eclipse 300 to investigate the effect of soaking time, injection pore volume and rate of injection on the heavy oil recovery. Result of experiments showed that huff and puff process under miscible pressure condition gives the most... 

    Solar Absorption Chiller Design

    , M.Sc. Thesis Sharif University of Technology Kariminiya, Hossein (Author) ; Farhadi, Fatollah (Supervisor)
    Abstract
    Solar radiation is a clean and renewable energy which is essential for all natural processes of the planet earth. The benefits of solar ventilation are more than conventional cooling systems. In this research, simulation and modification of solar absorption chiller (LiBr) was investigated. TRNSYS simulator software and Esfahan climate data were used. First of all, collector slope, rate of solar cycle pump, size of heat storage tank and size of collector were modified. Then, operation cost of a 5 tones solar cooling system with flat plate collector and evacuated tube collector was compared with conventional 5 tones capacity cooling systems such as direct fired absorption chiller and vapor...